Granulosa cell tumor • The most common type of ovarian tumor that is composed of cells that stain positively with inhibin. • Histologically, the cells may form Call-Exner bodies • The tumor cells may secrete estrogens and cause precocious sexual development in girls or increase the risk for endometrial hyperplasia and carcinoma in women. • Less commonly granulosa cell tumors can secrete androgens and produce masculinization.